Mercedes-Benz Body & Equipment Guideline for Metris - BM 447, Version November 27, 2015.
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7.6 Attachments
7 Modifications to the basic vehicle
7.6.4
Trailer hitch
We recommend only using trailer hitches (AHK)
approved by Mercedes-Benz or of equal reliability.
These should only be attached at the intended points
on the bodyshell (rear longitudinal member).
Technically, there is no problem retrofitting a trailer
hitch when a preinstallation (code E57) is already fitted.
If a trailer control unit was not pre-installed at the fac-
tory, it must be installed and connected in addition to
the retrofitted wiring harness. In addition, variant cod-
ing of the electronic ignition lock must be performed
otherwise malfunctions could occur. Variant coding can
be performed only with a Mercedes-Benz diagnostic
tool by an authorized Mercedes-Benz Metris dealer.